International organization with certifications ranging from snorkeling to course director. Information about their online courses and community, dive centers, gear, and vacations.

The World Underwater Federation. One of the oldest dive organisations in the world, and one that serves to coordinate standards among water sports and activities; including sub-diving, freediving and spearfishing.

International nonprofit training organization with certifications from skin diver through instructor course director. Includes information about courses, policies, and dive centers.

International organization offering training from snorkeling through Master Instructor. Includes course information, a schedule, online training, and a scuba rangers kids club.

Organized to provide the diver with safety oriented diving programs with an emphasis on environmental protection and personal enjoyment.

A sports diver training agency, teaching via the club principle, with more than 400 schools and 55, 000 members in over 50 countries.

The Handicapped Scuba Association is an independent training and certifying agency that specializes in recreational diving for people with disabilities.

Certifying Agency for Cavern and Cave Diving.

Diving association which provides the means for those with disabilities to become divers. Includes location of instructors and resorts, membership information, news, and a member forum.

Dive Rescue International 28 certification levels in SCUBA rescue, recovery and underwater investigation to law enforcement, fire rescue, SAR and EMS personnel, since 1977.